One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(6,10)(7,11)(13,14,17,19)(15,16,20,18)(21,22,26,24)(23,28,25,27)(5,6,9,10)(7,8,11,12)(13,15)(14,16)(17,20)(18,19)(6,10)(7,11)(13,15,17,20)(14,18,19,16)(21,23,26,25)(22,27,24,28)(1,2)(3,4)(5,7)(6,8)(9,11)(10,12)(13,15)(14,16)(17,20)(18,19)(21,24,26,22)(23,27,25,28)(5,8)(6,7)(9,12)(10,11)(13,16)(14,15)(17,18)(19,20)(21,25,26,23)(22,27,24,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.